When setting a special font of a given paragraph in the Editor component, if the "x" of the Font dropdown is pressed it will reset the font of this text to the default one. If we then want to change the format of a given paragraph(make it bold for example), we select the paragraph and click on the "Bold" button. The text which is being bolded is the one which font was previously reset, not the selected text which we expect to become bold.
The reported behavior is applicable to all styles - bold, italic, underline, text alignment, ul, ol.
When changing the style of a given selected text, after there was a font reset in the Editor, the new formatting we set is being applied on the text which font was reset, not on the selected one.
No matter the operations performed in the Editor when formatting a selected text, the format changes should be applied to the selected text only.